1 . Pump up the starting air reservoir to their maximum pressure and _ the air reservoirs and air system（历年真题）openclosedrainvent2 . The blower type crankcase ventilation system _（历年真题）remove combustible gases from the crankcaseprevents the formation of combustible gases in the crankcasecools lubricating oilimproves cold weather starting3 . According to Annex IV of comminuted and disinfected sewage using an approved system can be discharged when the ship is more than away from the nearest land.3 n mile 5 n mile 12 n mile 25 n mile4 . According to Annex I of MARPOL 73/78, the instantaneous discharging rate of the oily waste from cargo tanks of oil tankers must be lower than_ .30 liters per nautical mile 15 liters per nautical mile 30 ppm 15ppm 5 . According to Annex I of MARPOL 73/78, the discharging oil content of the machinery space bilges must be lower than_ .30 liters per nautical mile 15 liters per nautical mile 30 ppm 15ppm 6 . According to Annex I of MARPOL 73/78, oily waste from cargo tanks of oil tankers can be discharged when the ship is more than_ away from the nearest land.50 nautical miles 30 nautical miles 15 nautical miles 12 nautical miles正确答案为：A7 . In _, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.a flash generator a flash evaporator a vacuum boiling evaporator a boiler 8 . Current changing in direction and rising and falling in value is _.A.CD.Cgenerator fresh water generator 9 . The MARPOL Convention is the main international convention .about marine pollution prevention covering marine protection of life about marine about ship and port security10 . On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the _.accumulator spring compressor balance piston compensating needle valve proportional piston 11 . Maintaining the lowest possible scavenging air at all times is not recommended due to the possibility of the _（历年真题）air charge density becoming too highpiston crown surface becoming too coldformation of excessive quantities of condensatecompression pressure being greatly reduced12 . _may be defined as the process of supplying outside air to and exhausting air from an enclosed space（历年真题）Air-conditioningheatingventilationcooling and dehumidification13 . The interior of some diesel engine saltwater heat exchangers are protected from corrosion by the use of the _（历年真题）aluminum plateslead cathodescopper baffle platesacrificial zincs14 . The current flowing first in one direction and then in another is called_ current.an alternating a rush a direct an exciting 15 . _ is used to produce electric power.An alternator Fresh water generator A compressor A clarifier 16 . Under MARPOL Code the ship to which it applies has to carry _.an International Ship Security Certificate an International Oil Pollution Certificate a Safety Management Certificate an International Ballast Water Management Certificate17 . Which of the listed types steam traps operates on the principle that hot water flashes to steam when its vapor pressure is rapidly reduced?Ball float Thermostatic Bimetallic Impulse 18 . Diesel fuel vapors _.can not be ignited by a spark unless the vapor is in a confined space are nontoxic in all concentrations can not be ignited by a spark unless they are at their auto-ignition temperature are heavier than air 19 . The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to _compensate for low oil level increase governor promptness prevent governor hunting limit engine load 20 . When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and _.completely filled with saltwater filled with de-scaling compound tightly closed to exclude air vented to the atmosphere 正确答案为：D21 . As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?Compression ratio Fuel/Air ratio Compression pressure Lube oil pressure 正确答案为：B22 . overcurrent relay _ the motor contactor when the motor exceeds its rated current.connects trips fouls destructs 23 . The designed capacity is 25 tons a day, but the fresh water generator can only_ 22 tons at present.consumedistillrunoperate24 . A diesel engine is equipped with an isochronous hydraulic governorA decrease in load will cause the engine speed to _.decrease only increase only decrease slightly then returned to original speed increase slightly then returned to original speed 25 . Cold weather starting of a diese